One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,8)(5,6)(9,10,12,14)(11,15,16,13)(18,22)(19,25)(24,29)(26,32)(2,6)(7,8)(11,16)(13,15)(18,22)(19,26)(21,28)(23,30)(25,32)(27,31) involution — undirected(1,3,5,4)(2,7,6,8)(9,11,12,16)(10,13,14,15)(17,18)(19,27)(20,22)(21,24)(23,25)(26,30)(28,29)(31,32)(10,14)(13,15)(17,19,28,32,20,25,21,26)(18,23,29,30,22,27,24,31)(1,4,5,3)(2,7,6,8)(18,22)(23,27)(24,29)(30,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.